Question

where are the following structures located and what are their functions
1 Stigma
2 Anther
3 Placenta
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Answer 1

In a flower, this landing zone and entrance is the stigma. It plays a pivotal role in reproduction. Most stigmas are adapted to trap pollen with hairs, flaps and other surfaces to increase their efficiency. Most stigmas are covered with a waxy, sticky substance.

The male reproductive part of a flower is called the stamen. It is composed of a long tube, called a filament, and has a pollen-producing structure on the end. This oval-shaped structure is called the anther. It is crucial in the reproduction of flowering plants, as it produces the male gametophyte, known as pollen.

The ovules inside a flower's ovary (which later become the seeds inside a fruit) are attached via funiculi, the plant part equivalent to an umbilical cord. The part of the ovary where the funiculus attaches is referred to as the placenta.

Answer 2

Stigma: It has a sticky structure to trap pollen grains.They are the female part of the flower(Gynoecium).
Anther : It is the male part of the flower. It contains pollen sacs, where pollen grains are present.
Placenta : It is present in the bottom of the Gynoecium.They are the ovule bearing region of the carpel.